Front Matter -- Preface -- Contents -- Summary -- 1 Introduction to Dietary Reference Intakes -- 2 The B Vitamins and Choline: Overview and Methods -- 3 A Model for the Development of Tolerable Upper Intake Levels -- 4 Thiamin -- 5 Riboflavin -- 6 Niacin -- 7 Vitamin B6 -- 8 Folate -- 9 Vitamin B12 -- 10 Pantothenic Acid -- 11 Biotin -- 12 Choline -- 13 Uses of Dietary Reference Intakes -- 14 A Research Agenda -- A Origin and Framework of the Development of Dietary Reference Intakes -- B Acknowledgments -- C Système International d'Unités -- D Search Strategies -- E Methodological Problems Associated with Laboratory Values and Food Composition Data for B Vitamins -- F Dietary Intake Data from the Boston Nutritional Status Survey, 1981-1984 -- G Dietary Intake Data from the Continuing Survey of Food Intakes by Individuals (CSFII), 1994-1995 -- H Dietary Intake Data from the Third National Health and Nutrition Examination Survey (NHANES III), 1988-1994 -- I Daily Intakes of B Vitamins by Canadian Men and Women, 1990, 1993 -- J Options for Dealing with Uncertainties in Developing Tolerable Upper Intake Levels -- K Blood Concentrations of Folate and Vitamin B12 from the Third National Health and Nutrition Examination Survey (NHANES III), 1988-1994 -- L Methylenetetrahydrofolate Reductase -- M Evidence from Animal Studies on the Etiology of Neural Tube Defects -- N Estimation of the Period Covered by Vitamin B12 Stores -- O Biographical Sketches -- P Glossary and Abbreviations -- Index.